Diestock



A. F. HOW

April 21, 1931.

DIESTOCK Filed Aug. 20, 1928 2 Sheets-Sheet 1 April 21, 1931. A, HOWE 1,802,209

DIESTOCK Filed Aug. 20, 192a 2 Sheets-Sheet 2 Patented Apr. 2 1, 1931 UNITED STATES;

PATET oFFlca manna. HOWE, or OAKLAND; CALIFORNIA, Assmnon, BY ivinsnn nssrenmnn'rs 'ro THE BORDENCOMPANY, or WARREN, OHIO, a C-ORPORATION or OHIO 1 mns'rocx Application filed August 20, 1928. Serial No. 300,638.

-* This invention relates to a die stock of the type wherein the chasers are rigidly carried by a tubular .frame which may extend into a handle frame for rotating it. Preferably the handle frame carries a ratchet pawl acting on ratchet teeth which in Operation are rigid with the chaser carrying frame. The ratchet teeth may be formed on the chaser frame or may be on a separate ring'into which the chaser carrying frame fits-nonrotatably.

2 Mynvention is concerned primarily with the means for carrying the chasers on the tubular chaserframe. I have so devised this of a ratchet die stock embodying my inven tion; Fig. 2 is a-vertical section'thercof on a plane indicated by the line 2-2-on Fig. 1; Fi' 3 is a radial section on two planes in di'cated by the line 3-3 on Fig. 2; Fig. 1 is across section through the chaser-carrying frame, as indicated by the line 4-4 on Fig. 3; Fig. 5 is a perspective of one of the chasers.

As shown in Figs. 1, 2 and 3, the handle frame, designated 10, is shown as an annular member having a socket 11 into which the handle 12 is screwed. This frame is shown as carrying a ratchet pawl occupying a radial socket 13 in the handle and pressed inwardly by a compression spring '21which surrounds the shank 22 of the pawl, and is held in place by a stationary nut 14. The

tioning ring 60 may be slightly less than the pawl has at its inner end a tooth 23 which is abrupt on one face and inclined on the other.

In the drawings, I have shown a separate ratchet ring mounted within a recess in the handle frame, thisrecess being made by rabbeting-the frame and inserting a ring at the far edge, which may be held by a pin 41. It will be seen-from Fig. 2 that when the handle frame is moved in the right hand=direction, theabrupt face of the tooth 23 will engage a radial face of one of the teeth 31 on the ring, 30 and correspondingly rotate it, whereas when the handle frame is moved in the opposite direction the inclined face of the pawl engages such tooth and the pawl is cammed backwardly.

The ratchettooth may face in either direce 7 tion as desired, it being only necessary to draw outwardly on the head24 of the pawl a sufiicient distance to cause a pin 25 carried by the shank to clear a groove 15 in the frame,

then the pawl may be turned 180 and re-v turned to position and is then activeforrotation in the opposite direction.

It is to be" understood that so much of dle stock as has'been described in the above i threeparagraphs is; not specifically part of my invention. In my invention, the chasers 5O arerectangular blocks with the usual cutting" teeth 51 on one edge, while at the opposite edge is a cylindrical arc, asshown at 52. These chasers are placed in notches 61 in a positioning ring 60. This ring fits snugly within a flange 71 on a head member 70. This member hasan intermediate annular portion 72 from the outer edge of which the flange 71 rises. Extending in the opposite direction from the inner edge of the annular portion is a tubular extension 73 adapted to slide into the ratchet ring 30. This tubular extension is provided with an external key 74 which may pass through a notch 17 in'the handle frame into a groove in the ratchet ring, as illustrated in Fig. 2. The positioning ring is held in place against the base of the cup-like member'ZO by cap screws which screw through the ring into the annular portion 72 of the cup member.

The depth of the notches 61in the posi tice it is simply sufiicient so that when the screws 80 are turned into position the chasers are clamped against inward movement.

It will be observed that the chasers hear at their outer ends directly against the flange 71 of the cup member, which receives their outward thrust during action. This flange 71 is a turned surface of the die head itself, and the result is that by means of such turned surface and the rectangular chasers, it is possible to obtain great accuracy in the position of the cutting surfaces of the chasers. The expense of cutting notches in the chasers for engagement with positioning ribs, or holes for the passage of securing bolts, is avoided and greater accuracy obtained.

Occasionally dies become worn unevenly, or in 'nding one is ground too short. My inventlon enables such worn or short die to be used by simply placing a shim, indicated at 90 in Fig. 4, behind the chaser. By my construction, such shim is effectively held in place by the flange? 1 of the cup and the sides of the notch 61 in the positioning ring.

It will be noticed that the height of the flange on the head is considerably less than the height of the chasers. This enables a portion of each chaser to be visible from the outside, so that it may be readily seen whether the chaser is bearing snugly against the flange, or whether its shim is properly positioned, in case one is employed. I find that the short flange is amply suflicient to receive the thrust of the chasers. The space above the ring also furnishes means for the insertion of a tool to shove the chaser inwardly to release it when desired without taking the entire construction apart.

My invention is very simple in construction, is effective in operation and has the advantage stated of accuracy and ease with which a short chaser may be remedied. It also enables the ready substitution of chasers of different pitch, in case it is desired to cut some thread other than the standard.

I claim:

1. In a die stock, the combination with a handle frame having an opening, a rotatable head having a sleeve portion extending into said opening to be driven thereby and having an oppositely extending flange at the outer edge of its opposite side, a ring fitting snugly within said flange, notches formed in said ring leading from the inner end thereof and extending radially through the ring, chasers occupying said notches and positioned by the ring against non-radial displacement, the chasers at their ends abutting the flange of the head which receives the outward radial thrust of the chasers, the ring preventing displacement of chasers in one longitudinal direction and the head in the other longitudinal direction, and bolts to hold the ring in place within the flange.

2. In a die stock, the combination of a handle frame having a ratchet pawl, a ring rotatably mounted within the handle frame and having external teeth adapted to be engaged by said pawl, a rotatable tubular head having a tubular shank occupying the ratchet ring and provided with a key to prevent independent rotation, said head having a disklike portion extending outwardly from one end of said sleeve. said disk-like portion being adapted to lie along one face of the handle frame, the head being formed with a cylindrical flange extending in the opposite direction to the sleeve at the outer end of the disk like portion, a radially notched ring fitting snugly within the flange of the head, screws passing through said ring between the notches for clamping it tightly to the head, and radial chasers in the notches bearing at their outer ends against the flange of the head.

3. In a die stock, the combination of a chaser-carrying head having a sleeve with an outwardly extending annular portion, a driving member adapted to embrace the sleeve for driving such head, the head being made up of two rigidly connected members, one of which is notched to receive the chasers and the other of which has a flange to embrace the first member and form an abutment for the outer ends of the chasers, the first member fitting snugly within the flange with its notches facing the second member, rectangular chasers occupying said notches, and means for forcing the two members together longitudinally until the top and bottom faces of the chasers are effectively engaged by said members respectively.

4. In a die stock, the combination'of a rotatable head, comprising two members, one having a flange and the other seated within the flange and having a radial notch leading from its inner face, a chaser occupying said notch, a shim at the distant end of said chaser standing within the notch of the ring and held against outward longitudinal movement by the portion of the ring which forms the base of the notch therein, said shim bearing at one face against the flange and at the other against the end of the chaser, and means for rigidly clamping the notched member and flanged member together.

5. In a die stock, the combination of a rotatable head having a tubular extension and an annular flange extending in opposite directions, a driving device embracing the tubular extension, a ring seated within the flange and having radial notches, leadmg from the inner face of the ring, chasers occupying said notches and normally abutting at their ends the flange of the head, the body of the notched ring which forms the base of the notches extending uninterruptedly to the outer periphery of the ring whereby one or more shims may stand at the distant end of one or more chasers and be retained within the corresponding notch of the ring and bear at one face against the flange and at the other against the end of the chaser, and longitudinal bolts passing through the ring into the head for holding the ring rigidly to the member carrying the 6. In a die stock of the fixed chaser type, the combination of a rotatable tubular head formed with an integral flange internally cylindrical, a radially notched externally cylindrical ring fitting snugly within the flange with its notch openings toward the head, means for clamping said ring tightly to the head, the notches of the ring being deeper than the height of the flange, whereby the. ends of the chasers abutting said flange are I visible, and radial chasers in the notches bearing at their outer ends against the flange of the head.

7. In a die stock, the combination with a driving means, of a driven member-formed with a cup-like end, a notched ring occupying a such end with its notches facing the driven member, bolts connecting the ring rigidly with the driven member, chasers occupying the notches of the ring and clamped in place by opposed surfaces of said driven member and ring with the outer ends of said chasers abutting the wall of the cup.

In testimony whereof, I hereunto aflix my signature.

, ALFRED F. HOWE. 

